Gene Wagenbreth <genewxxx@isi-OS4> wrote in news:hcsheg$33m@venera.isi.edu:

> I have a 1990 Honda Accord. It usually runs with the temperature
> guage in the middle range. Frequently the guage will quicky go up
> to close to, but not at the high end red mark. This happens even
> when its 50 degrees out and I am going 45 mph. If I turn on the
> heater the temperature usually goes back to middle. It goes down
> very quicky, within 10 seconds of turning on the heater. I dont
> believe the heater could cool things off that quickly.


It can indeed! Considering there's only about 20F or so difference between
"normal" and "overheat", the heater doesn't have to do much to cool the
engine down sufficiently.


>
> I have a new radiator and antifreeze. I am not loosing coolant.


Why was the old rad replaced? And how old was the coolant that was in there
before?


>
> Could it be a hose or chamber that is blocked/pinched, and turning
> on the heater is allowing the coolant to byupass the blockage ?
>
> Any helpful comments appreciated.
>


Sure does sound like a sticking thermostat. I'll bet it's crappy
aftermarket, too.

The heater feed is independent of the thermostat, so it will work even when
the engine is cold and the thermostat is closed.

Try a new OEM Honda thermostat. About $40 or so and worth every penny.



--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/